package Review;

import com.mysql.cj.jdbc.MysqlDataSource;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.text.MessageFormat;
import java.util.Scanner;

public class Demo1_DataSource {
    public static void main(String[] args) {
        //1.定义MySQL数据源对象
        MysqlDataSource mysqlDataSource = new MysqlDataSource();
        //设置数据库连接
        mysqlDataSource.setURL("jdbc:mysql://127.0.0.1:3306/javatest?characterEncoding=utf8" +
                "&allowPublicKeyRetrieval=true&useSSL=false");
        //用户名
        mysqlDataSource.setUser("root");
        //密码
        mysqlDataSource.setPassword("Wm127369#");
        //定义JDBC的数据源对象
        DataSource dataSource = mysqlDataSource;
        //定义连接对象
        Connection connection = null;
        //定义预处理SQL执行对象
        PreparedStatement statement = null;
        //定义结果集
        ResultSet resultSet = null;
        try {
            //1通过数据源获取数据库连接
            connection = dataSource.getConnection();
            //2.获取预处理SQL执行对象
            //定义要执行的SQL
            String sql = "select student_id,sn,name,mail,class_id from student where name = ?";
            statement = connection.prepareStatement(sql);
            //接收用户的输入
            System.out.println("请输入学生的姓名：");
            Scanner scanner = new Scanner(System.in);
            String name = scanner.next();
            //3.用真实值替换占位符
            statement.setString(1,name);
            //4.执行SQL,获取结果集
            resultSet = statement.executeQuery();
            //5.遍历结果集
            while (resultSet.next()){
                long stuId = resultSet.getLong("student_id");
                String stuSn = resultSet.getString(2);
                String stuName = resultSet.getString(3);
                String stuMail = resultSet.getString(4);
                long classId = resultSet.getLong(5);
                System.out.println(MessageFormat.format("学生编号 = {0},学号 = {1},学生姓名{2},邮箱 = {3},班级编号 = {4}",stuId,stuSn,
                        stuName,stuMail,classId));
            }
        }catch (SQLException e){
            e.printStackTrace();
        }finally {
            //依次释放资源，关闭连接
            if (resultSet !=null){
                try {
                    resultSet.close();
                }catch ( SQLException e){
                    e.printStackTrace();
                }
            }
            if (statement !=null){
                try {
                    statement.close();
                }catch ( SQLException e){
                    e.printStackTrace();
                }
            }
            if (connection !=null){
                try {
                    connection.close();
                }catch ( SQLException e){
                    e.printStackTrace();
                }
            }
        }
    }
}
